Concrete-distributing machine



July 14, 1925 E. H. LICHTENBERG CONCRETE DI STRIBUTING MACHINE OriginalFiled July 19, 1920 s'sheetssheet 1 July 14, 1925.

E. H. LICHTENBERG CONCRETE DISTRIBUTING MACHINE Original Filed July 19,1920 5 Sheets-Sheet 2 3n neuron Jui 14, W25.

E. H. LICHTENBERG CONCRETE DISTRIBUTING MACHINE Original Filed July 19,5 Sheets-Sheet Ill!ll'lllllillfllllllllllll'lilflfll l llljlill 15* July14, 1925.

1,5462 92 E. H. LICHTENBERG CONCRETE DISTR IBUTING MACHINE OriginalFiled July '19, 1920 5 Sheets-Sheet 4 $2333] 14, i 925. E. HYLICHTENBERG CONCRETE DISTRIBUTING MACHINE Original Filed July 19, 1920 5h e heet 5 Patented at; 14, 1925 UNITED STATES 1,546,292 PATENT OFFlCE.

ERICK H. LIGHTENZBEBG, O'F-MEWAUKEE, WISCONSIN. ASSIGNOR TC KOEEBINGCOI- PANY, OF MILWAUKEE, -WISCONSITN, A CORPORATION.

coNcanrn-ms'rmau'rme momma Original application filed July 19; 1920,Serial No. 897,431. Patent-No. 1,411,217,- dated Iaroh- B8, 1998.

' Divided and this application filed Hatch 24, 1922. Serial No'.546,278,

To an wiwm it may concern:

Be it known that I, ERIGH H. Llcn'inn- BERG, a citizen of the UnitedStates, residing at Milwaukee, in the county of M1l-' c waukee and Stateof 'Wisconsin, have in:

vented certain new and useful Improvements inConcrete-DistributingMachines, of

which the following is. a specification.-

In the art-of laying concrete roads, pavew ments and the like, there iscommonly used as the most expeditious and economical method ofdistributing theconcrete or mixed aggregates of whichthep'avement is.composed, a machinewhich comprises, generally speaking, acombined mixerand boom and bucket distributing means. This machine ordinarily known asthe Koehring paver, embodies a portableqplant which includes theconcrete mixing and customary 2c appurtenant control ifiechanisms,together with the boom and bucket attachment operated from thesame poweras used for the mixing machine and controlled by the same operator. I Mypresent improvements comprlse a d v sion' ofmy c0 endin application forpatent Serial No. 3 431, ed July 19, 1920, now matured into LettersPatent No. 1,411,217 issued March 28, 1922, and among the principalobjects of said improvements are the simplifying of the driv ngmechanism utilized for causing the bucket to traverse "the 'boom bywhich the distributionof the concrete over a relatively large area maybe performed; the provisionof a'more positive driving mechanism for thepn e just outlined; and the improvement 0 certain knock-out or clutchneutralizing devices, certain of which have been heretofore roployed inconjunction with the'drivi devices for the. bucket mechanism, where y it6 the machine is operating in a 'onwherein the boom is inclined upwar1y, the inward and downward ,vmfivement of-the bucket; may be retardedunlit approaches posed by me for automatically (llSGOIltlIlll- 'portinments resides in special braking means em the mixer end of the boomthrough the action of automatic braking mechanism.

grade. This feature of my invention isof importance and involves theworm and worm gear contrivances originally proposedin the Letters PatentReissue No. 13,617,, issued September 16, 1913, to Phili Koehring, saidpatent covering the basic machine improved by the features of my LettersPatent No, 1,141,470 and. No. 1,113,-

661 issued June 1, 1915 and ()ctober13,

1914 respectively. [In the operation of the worm and worm gear boomturning means,

there has been a tendency heretofore to cause locking of the'png wormgear contrivances, owmgf to'the mbmentum 'of the boom oncefthehorizontal movement 1s imparted thereto. I merely mount my worm in aresilient manner as regards end-wise movement, in respect to the engagedworm r, and in this way eliminate the possibi ity of the disadvantathesame time rendering more easy the operin respect to initiating as wellas stopping said boom movement. I a

The present invention furthermore involves a novel improved connectionintermediate the trip mechanism on the carriage. and the doors of thebucket, the said connection involving resiliently acting'parts.Additionally th invention involves a new form of resilient bumper meansintermedi-r geous locking of the parts as referred to,at

V ation of'theboom by said parts manually ate theoarriage and thebracket means supthe boom swinging worm'gear. A' 1111 comprehension ofthe-improvements of this invention will be had upon an understanding ofthe machinesof the Let- 'ters Patent previously set forth herein'finconnection withthe followingdescription" and theaccompanying drawings inwhich .105 Figure 1 is a side view showingparticu larly the boom andbucket attachment as designed with the present improvements, dottedlines indicating in a general way the adjacent end portion of the mixingmachine upon which the boom and bucket mechanism is mounted.

Figure 2 is a fragmentary view showing more particularly the automaticstop mechanism at opposite ends of the boom for cooperation with thedriving gearing to render the latter inactive at proper times. Figure 3is a view looking toward the delivery or discharge end of the mixer andbringing out more clearly the controlling lever and clutch shiftingmechanism and adjacent driving mechanism above the inner end of theboom.

Figure 4; is a vertical sectional view through the boom and lookingtoward the outer side of the bucket, bringing out-more fully themounting of the carriage on the boom and bucket-door closing device.

Figure 5 is a plan View showing primarily the parts illustrated in Fig.1, the bucket and certain of the parts beneath the boom being omitted. v

Figure 6 is a plan viewbringing out clearly the worm and worm gearturning devic as improved, also the bumper co-operative with thecarriage to limit the inward movement of the bucket on the boom. I

Figure 7 is a vertical sectional view taken about on the line 7 7 ofFig. 2.

Figure 8 is a similar section taken about on the line 88 of Fig. 2.

Figure 9 is a vertical section taken through a portion of the carriageshowing the shuttle or slide of the tripping device.

Figure 10 is a plan view of the same including a trip member.

Figure 11 is a section on the line 11-11 of Fig. 10.

Figure 12 is a front view showing more clearly the winding drum of thedriving mechanism.

Figure 13 is an enlarged view showing more clearly the adjustable stopon the carriage; and

Figure 1 1 is a perspective view showing more clearly the arrangement ofthe lever arms and links of the clutch shifting and knock-out devices.

Referring to the drawings in which the same reference characters areused to designate corresponding parts in difierent views, and describingthe improvements thereof in detail, A denotes the portion of the mixingdrum of the mixing machine illustrated in conjunction with the boom andbucket mechanism, B the frame work of said machine, and G the toothedgear rings carried by said drum A and by which it is rotatably operatedin a Well known manner. The boom and bucket mechanism embodies as itsprimary features the boom 1 and the bucket 2, the latter spaced from theground, power operated, and being normally non-discharging'in its bodyconstruction.

The driving mechanism by means of which the bucket is caused to traversethe boom 1 comprises a pair of shafts 3 and 4 having pinions at one endmeshing with the gear-ring C of the drum A whereby motion at oppositeends large bevel gears 10 with which the gears 5 and 6' mesh. Theopposite ends 11 and 11 of an operating cable 11 wind around the drum 9in opposite directions, and have the extremities thereof fixedlyattached to the drum as shown best in Fig.12 of the drawings. The saidcable 11 extends from the end portion 11 down under a show e journaledon top of the boom 1 thence outwardly along the boom around a sheave '13at the outer extremity of said boom. From the sheave 13 the cable 11 istrained inwardly along the boom adjacent to its under side, said cablepassing thence upwardly over a sheave 1 1 located adjacent to the pointof pivotal support of the boom 1. At this point the cable 11 has its end11 connected with the drum 9 in the manner previously suggested. Thesheaves 12 and 14; are located so that the portions of the cable 11passing over the same are substantially in vertical alinement with theaxis of rotative movement of the boom 1 established by the verticalpivot 15. nects the boom with the bracket 16 projecting from theframe Bof the machine, said bracket forming the main support interme diate theboom and the frame work of the mixer.

To operate the clutches 7 and 8 a rocker lever 17 (see Figs. 3 and 5) isemployed, the same being equipped with shifting forks and being mountedupon a vertical shaft 18, seen best in Fig. 3. The shaft 18'l1as a main.hand lever 19 connected with its lower end and this lever is operable toalternately render the clutches 7 and 8active for ellecting reversemovements of the drum 9 and cable 11 or to maintain the clutches 7 and 8in neutral positions. a

The reverse operation of the drum 9 is effective to cause reversemovement of the bucket 2 relative to the boom 1 by interconnectionsbetween the cable 11 and the carriage 20, which interconnections arevery The pivot 15 conllO the carriage 20 is'best shown in Figs. 9 to 11.For the above purpose Iprovide on the carriage 20, slidable in suitableways or grooves 23 at opposite sides of the latter, a'

slide or shuttle 24. The slide or shuttle 24 has end bars with openings25 through which the cable' 11 passes and mounted on the shuttle member24 is a trip .26 pivoted at 27 and having an upwardly extending arm 28.Centrally of the slide or shuttle 24 there is mounted'a slack take-upshaft 29 equipped with ratchet wheels 30 and about which the cable 11 iswound so as to extend from the shaft in opposite directions. It will beevident that by turning the shaft 29' by the application of any suitabletool, any unnecessary slack in the length of the cable 11 may be takenup.

The action of the trip 26 is very similar to the action of certaincorresponding trip mechanism of my previous Patent No. 1,141,470, andwill be generally set forth hereinafter. Y a

Reverse movement of the cable 11 imparts corresponding movement to thecarriage 20, and said carriage supports the bucket 2 for a correspondingmovement of the latter. I utilize my previously invented and well knowncam 31 toco-opera'te with an "arm 32 on the shaft 33 for the urpose ofclosing the bottom door 34 o the bucket 2. The bottom door 34 isconnected by linkage 35 and spring 36 with the curved'link 37 which inturn is attached to the throw .over arms 38 projecting from the shaft 33all substantially as disclosed in my. last named Letters Patent. j

' The design of, my bucket 2 and the openable door'34 is especiallynovel and'importent. The door 34 is of a len h corres 0nding to thewidth of the hue et 2, an said door 1s variably limited in its openingmovement by means of an adjustable stop 39 which is attached to one sideof the carriage 20 and adjustable lengthwise of said carriage with thearm 32 to limit the movement of said arm in the direction of the mixer,as the arm is shifted to throw over action of the arms 38 under theinfluence of the trip 26. That is to say, the door 34 can open just sofar as is determined by the movement of the arm 32 in the action of triping the door 34 to effect said opening. t is the adjustability of thestop 39 which admits of the flowing of the concrete aggregates from thebucket 2 in a ribbon-like stream, the thickness of which de nds u n theextent of opening of said oor, an

by means of a suitable bolt passing, through the said stop. The stopco-acts' retarded egress of the aggregates because of the restriction ofthe door opening. Necessarily the thickness of the stream of materialsdischarged from the bucket 2 determines the depth of the layer ofconcrete or aggregates dispensed, so to speak, by the bucket. The bucketopening and door 34 are advantageously arranged transversely of theboom, and of the direction of travel of the bucket 2, for theattainmentof the above result of depositing the plastic aggregates in a layer ofmeasured thickness.

The bucket 2 is designedly a low discharge bucket; in other words, thedischarge end of the bucket is very near the ground so as to admit ofthe laying down of the concrete in a relatively thinribbon-likegravitating stream of a width'equal to the width of the bucket and of adepth regulated by adjustment of the stop 39 controlling the operativearea-of the opening made by release of the door as the latter drops toits effective opening position.

The boom 1 is adapted to be raised and lowered byvertical movement of anaxis established by the horizontal pivot 40. connecting the boom withthe vertical pivot 15 on the bracket 16. The means utilized for thispurpose are like those heretofore proposed including a cable 41 attachedto the upper frame work B of the machine v(see Fig. 1) passing around asheave 42 on'the boom 1 intermediate theends of the latter, thencepassing up and around another sheave 43 on the frame work sections, downagain around a second sheave42, co-axial-with the previous sheave 42,and thereafter passing to awindlass device shown at 44 as mounted on theboom 1 adjacent to the inner end of theboom. v

On the boom 1 there is provided certain automaticall operating clutchknock-out mechanism or the clutches 7 and 8. This mechanism is seenbestin Figsr2 and 3 of the drawings. In the outward traverse of thecarriage" 20 with the bucket 2, if the operator does not reversethemovement of the cable 11 by manual control of the clutches throughthe lever 19, said carriage will strike the knock-out or shifter arm 45located adjacent to the outer end of the boom and pivoted to a bracket46 thereon. The arm 45 is equipped with'a pull rod 47 extendinglongitudinally of the boom intermediate the channels thereof. .Whentheknock-out or shifter arm 45 is rocked upward'a pull is exerted on therod 47 and said rod actuates a bell crank lever 48 near the inner end ofthe boom in such a manner as to pull downwardly upon a bar 49 which isattached to another bell crank lever 50 which is pivoted at 51 ontheframe work B. The vertical arm or lever 50 is connected with ahorizontal arm 52 and olfstanding due to from the shaft 18 which it willbe recalled is 4'0, thereto to turn therewith; The worm op- .era-te'sbetween boxes 59 in which the shaft 57 isjournaled on the bracket 16 andsprings lever 45. On inward movement of the car riage 20, in order toautomatically neutralize or render ineffective the one of the clutches 7or 8 which is employed to cause return movement of the carriage upon theboom, there is provided a cam 53, seen best in Fig. 2, and this cam isadapted to ride beneath the roller 54 on the bottom of the bar 49,thereby raising said bar and effecting the operation of knock-out of theeffective clutch by which the return movement of the carriage and bucketis being caused. Thisaction will be obvious with the previousdeseription of the clutch neutralizing operation from the knock-outmember 4:5 and-the principle of operation is quite similar to that foundin my Letters Patent No. 1,113,661 previously referred to.

There isleft to be describedthe means for turning the boom 1 by'movementin a hor-' izontal plane, said means involving generally the previouslwell known worm gear sector fixed on t e pivot 15 by which the boom issup-ported for said horizontal movement. This worm gear is engaged by aworm 56 on-the manually rotatable shaft 57 adapted to be turned by thewheel 58. The Worm 56 may be said to be a floating worm to the extentthat it is movable endwise on the shaft 57, though of course, splinedare interposed between said boxes 59. On turning the shaft 57 to swingthe boom 1 horizontally, the initial action of the worm 56 is to yieldby compression of one of the springs 60, the one, in the directionopposite that in which the boom will turn. After slight compressionofsaid spring, the boom will begin. to swing and the worm willbecomecentralized. between the boxes 59 under-v the action of thesprings. On stop age of the turning movement of the shaft 5 if there iscontmued movement of the boom under the'impetus of its swing produced bymanual o eration of the wheel 58, said worm 56 "will yieldlongitudinally on the shaft 57 andthere will. be no-tendenc 55 and 56 tobecomelocked by the friction incident to. the. action of theworm 56 as astop for. limiting the movement or swinging of the boom. There ismounted .upon.

the -,worm gear 55 a yieldable bumper 61 with which the carriage 20 mayabut as it for the parts reaches the inward limit of its movement intraversing the boom 1. The bumper includes a plate 61, and two springs61 interposed between said plate and two pivot lugs 55 on the gear 55.It will be evident that this bumper 61 affords a resilient means,intermediate the bracket 16 and the carriage by which the bracket'2 issupported to absorb the shock incident to abutment between the above.parts as the bucket reaches its charging position. adjacent to themixer. As previously described, I utilize linkage 35 and a spring 36cooperative with the curved link 37 and arms 38 to connect the tripmechanism with the bottom doors 34: of the bucket 2. The specific modeofconnection of these parts is novel in that I use a cross plate 37through which passes the bolt 37 that is encircled by the spring 36',previously mentioned. The curved link 37- is so arranged that the bolt37 lower end as seen in Figure 1. The upper link members of the linkage35 pass through the opposite ends of the plate37 and the spring 36 bearsupwardlyagainst the intermediate portion of said plate 37 from beneath.The parts 35 and'36, 37 and 37 virtually form a resilient connectionbetween the arms'38 and the doors, so that if any foreign matter shouldlodge between the doors 34 and the body of the bucket 2 no breakage willresult in the said connecting means.

It is furthermore notable that the .lever 50 controlling the reversingor clutch neutralizing action previously described is adapted to performan additional function to that of rendering the clutch 8 ineffective;The operation of this lever to turn the shaft 18 is adapted to turn anarm 62 just above the arm 52 of the shaft 18. The arm 62 is connected bylinks 63 with the toggle lever 64.- interposed between a bracket 65,

on the frame work, and the free end of a brake band 66 which partiallyencircles the clutch member 8, co-operateswith the clutch 8. Thus it isthat through the operation of the automaticv clutch knock-out mechanismacting on the lever 50 or by the control of the shaft 18 through thehand lever 19 previously described, the parts 62, 63 and 66may beoperated to apply a brake to the clutch 8 and thus brake the operationof the pinion 6 operating the adjacent drum 9. In this way quickreduction of the movement of the drum and corresponding passes throughits stoppage of the movement of the bucket outwardly and inwardly iscontrolled.

The automatic braking means for retarding the movement of the bucket asabove described, is particularly useful Where the )machine is disposedupgn .a grade which requires that the boom elevated so as to inclineupwardly and-. outwardly from the mixer, bearing in mind the sizeand'welght er drum A into said bucket.

of the bucket, it will be evident that some braking means is verydesirable to govern the inward movement of the bucket, both when theboom is adjusted in a horizontal plane, and especially when it isdisposed in an inclined position as described.

The general operation of my machine according tothe design hereinbeforedescribed is as follows:

The bucket 2 is filled by the customary discharging of a predeterminedquantity of concrete or mixed aggregates from the mix- The aggregatesare now ready to be distributed or laid upon the sub-grade for whichpurpose the operator will manually actuate the lever 19 to throw intooperation the clutch mechanism whereby to drive the drum 9 in thedirection to effect an out-haul movement of the lower bight of thecable. The initial out-haul movement causes the trip member 26 to assumean operative position on the outer sideof the upper end of the arms 38and continued out-haul movement causes the carriage 20 and the bucket 2to traverse the boom 1 until the operator reverses the movement of thecable 11 by proper control of the clutch mechanism. On reversing themovement of the cable 11 the slide or shuttle member 24 moves in thedirection of the inner end of the boom, the trip member 26 actuates thethrow-over arms 38, rocks the shaft 33 and releases or opens the door34; of the bucket. The mixed aggregates in the bucket are in a freeflowing state and the reversing of the cablemovement is intended notonly to efiect opening of the door 34, but also immediate returntraverse of the bucket 2 relative to the boom 1. The combination of thedoor opening and the return traverse movement of the bucket 2 areimportant to my invention because such actions together are efiective tostream the a gregates from thebucket 2 in a ribbonli e layer ofsubstantially rectangular crosssection as previously described, thethickness or depth .of which layer is controlled by the stop 39. As thebucket 2 returns to its position adjacent to the mixer and at the innerend of the boom 1, the cam 31 engages the cross-arm 32, restores thethrow-over arms 38 to their elevated bucket door closing positions, andautomatic stopping of the carriage 20 and. bucket 2 1s efiected throughthe action of the clutch knock-out mechanism hereinbefore described.

If the operator fails to cause a reverse movement of the cable 11 byoperation of the lever 19 manually the efiective action of the bucketdischarge will begin to take place as the bucket reaches the outer end 0the boom. This will be erformed automatically through the carriage 20abutting with and operating the knock-out or shifter arm 45 of theclutch mechanism controlling the drive means. Furthermore, the operationof the arm 45 will be such as not only to render inactive the clutchcontrolling the out-haul movement of the cable, but to render active theclutch which embodies the in-haul movement of said cable whereby themovement of the bucket 2 will be actually reversed so as to insure thelaying of the concrete by streaming of the same out of the bucket 2 inthe manner above set forth. The method which I practice in the actualoperation 'of my machine is the conveying or conducting of theaggregates mixed in the mixer to the site of deposit, by the distributmgelement or bucket of course, and then while the aggregates in theirplastic condition are in movement they are caused to flow gravitativelyfrom the bucket in a continuous stream of'a redetermined depth orthickness substantially equal to that of the slab or portion of pavementof which the particular batch of the aggregates will ultimately form apart. By this method laborious work in spreading the materials is saved.This is a novel method of my invention.

The action of the brake-band 8 is inci= dent to straightening of thelinks of the toggle lever 64 and takes place on both the in 2aul andouthaul movements of the bucket Whether the operation of the member 45effects mere neutralizing of the clutch devices requirin the reversemovement of the bucket to be e ected by manual operation, or reversingof the clutch mechanism and inhaul movement bf bucket 2 depends on theadjustment of the arm 45, and the latter is controlled b adjustment ofturnbuckle 4:7 in the length of the rod 47, or in any suitable manner.

Of course the dumping and reverse movement of bucket 2 maybe performedat any point in the outward movement of the bucket, as well understoodon reference to my precious patents.

It is notable that as the portion. 11 of the cable unwinds from thespiral oove of the drum 9, the portion 11 win s into the vacated part ofthe groove, and vice versa.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent is: I

1. A boom and bucket attachment for concrete mixers, the same having incombi nation, a support, a boom mounted to swing horizontally thereon, acarriage adapted to traverse said boom lengthwise thereof in oppositedirections, a concrete distributor bucket mounted on said carriage, thebucket comprising dumping means for emptying it of its contents, trimechanism on the carriage for contro ing the said dumping mechanism,cable apparatus iated wit brake means on both the outwar a part of thecable apparatus to operation of the bucket.

the boom and trip mechanism and carriage so as to control the movementof the carriage on the boom and the operation of the trip mechanism fordumping the bucket, and automatic brake mechanism mounted on the'supportcarrying the boom and oper-- atively connected with a part of the cableapparatus aforesaid, to retard the movement of the latter and therebycontrol its action in relation to the carriage.

2. A boom and bucket attachment for concrete mixers, the same having incombination, a support, a boom mounted to swing horizontally thereon, acarriage adapted to traverse said boom lengthwise thereof in oppositedirections, a concrete distributor bucket mounted on said carriage, thebucket comprising dumping means for emptying it of its contents, tripmechanism on the carriage for controlling the said dumping mechanism,cable apparatus associatedwith the boom and trip mechanism and carriageso as to control the movement of the carriage on the boom and theoperation of the trip mechanism for dumpln 1 the bucket, and a brakemechanism mounte upon the support on which the boom is mounted andoperatively connected with a part of the cable apparatus, together withmeans forautomatically appliying said and inward movements of the bucketalong the boom. 1 n 3. In a boom and bucket attachment for concretemixers, the combination of a support, a boom pivotally mounted-upon saidsupport to swing horizontally, a bucket adapted to travel inwardly andoutwardly upon and suspended from the boom, said bucket comprisingdumping means there for, cable ap aratus for controlling the movement ofthe bucket and the tripping of its dumping mechanism, and anautomatically operable brake means cooperative with control the 4. In aboom and bucket attachment for concrete mixers, the combination of asupport, a boom pivotally mounted uponsaid support to swinghorizontally, a bucket adapted to travel inwardly and outwardly upon andsuspended from the boom, said bucket comprising dumping means there for,cable apparatus for controlling the movement of the bucket and thetripping of its dumpingmechanism, and an automatically operable brakemeans cooperative with a art of the cable apparatus to retard the hue etin its movement in opposite directions relative to the boom.

5. In a concrete distributing machine, the combination of a boom, abucket for traversing) movement thereon, means to drive said ucket toand fro on the boom, and means to discontinue the driving action of thedriving means in respect to said bucket, I

and to simultaneously brake the movement of the bucket relative to theboom.

6. In' a concrete distributing machine, the combination of a boom, abucket for traversing said boom back and forth, clutch mechanism,driving mechanism adapted to be connected by said clutch mechanlsm foractuating the bucket, means to render said clutch mechanism inoperative,brake means for retarding the movementof the bucket along the boom, andinteracting means between said clutch and brake means. I

7. In a boom and bucket distributor, the combination of a boom, a bucketto traverse the boom, cable driving means for said bucket, and connectinmeans intermediate the bucket and cable riving means including a slacktake-up device for the cable means.

8, Means as claimed in claim 7 combined with a carriage which supportsthe bucket on the boom, and which supports the driving connectionbetween the cable means and said bucket, said driving connectioncomprising a winding member constituting said slack take-up device, anda shuttle member, a trip art connected with the shuttle member, aischarge. door for the bucket and discharge door operating means on thecarriagte adapted to be actuated by said trip par c 9. In aboom, andbucket attachment for concrete mixing machines, in combination, a boom,a bucket adapted to travel longitudinally on the boom back and forth,cable apparatus'cooperating with the bucket in its back and fortmovement, the bucket comprlsing dumping mechanism, tripping mechanismarranged to coact with said dumping mechanism to operate. the latterthru the cooperation of the cable apparatus with said trippingmechanism, and an operative' connection between .the trip mechanismand'a part of the cable apparatus, including a cable take-up means.

10. In a boom and bucket attachment for concrete mixing machines, incombination,

a boom, a bucket ada ted to travel longitudinally on the boom ack andforth, cable apparatus cooperative with the bucket in its back and forthmovement, the bucket comprising dumping mechanism, tripping mechanismarranged to co-act with said dumpingmechanism to operate the latter thruthe cooperation of the cable apparatus with said tripping mechanism, andan .operative connection between the tri ping mechanism and the portionof the cab e a" aratus that co-a'cts therewith to dump t e ucket,including a cable tension take-up device.

11. In a boom and bucket attachment for concrete mixers, in combination,a support, a boom mounted to swing. horizontally fill thereon, a bucketarranged to move back and forth along the boom to carry concrete froma'mixer to a point of deposit in the length of the boom, a carriage onthe boom supporting said bucket for its said movement, the bucketcomprising a dumping means therefor, trip mechanism on the carriageconnected with said dumpin means for shifting the latter to and fromumping positions,'cable apparatus controlling the operation of saidtripping mechanism, and means operatively connecting the cable apparatuswith the tripping mechanism, including cable tension take-upinstrumentalities.

12. In a machine of the class described, in combination, a boom, acarriage arranged to move back and forth on the boom, a bucket supportedb said carriage, cable controlling means for t e carriage, and 'atake-up connection intermediate said cable means and the carriageincluding a winding shaft mounted on .the carriage and about which thecable is adapted to be wound in order to take up slack.

13. In a concrete distributor of the boom and bucket type, a boom, acarriage slidable back and forth on the boom', a bucket supported bythe-carriage, a cable for moving the bucket back and forth and aconnection intermediate the cable and the carriage including a shaftmounted on the carriage and adapted to be rotated, and connecting meansbetween the shaft and portions of the cable whereby the cable may bewound about the shaft to take up slack in the cable.

14. In aboom and bucket attachment for concrete mixers, in combination,a support, a boom adapted to swing horizontally thereon, a carriageadapted to move back and forth on the boom, a bucket suspended' from thecarriage and comprising dumping means, tripping mechanism on thecarriage for said dum mg means to render it operative and inoperativeand including a knockover link shiftable from a position maintaining thedumping mechanism'inoperative, to one rendering it operative, and viceversa, cable apparatus cooperative with the tripping mechanism andincludin a cable part having connection with the %atter, the saidconnection involving cable tension take-up instrumentalities.

15. In a boom and bucket concrete distributor the combination with aboom, of a connected to the carriage, said dumping means being inactivewhen the pivoted trip member is in its normal uppermost position andrendered operative by pivotal movement ofsaid trip member downwardly tolower said linkage.

16. In a boom and bucket concrete distributor, the combination with aboom adapted to swing horizontally, a carriage adapted to travel backand forth on the boom, a bucket supported by said carriage and havingdumping means at its bottom portion, trlp mechanism on the carriageincluding a shaft, a curved link operativelyv connected with said shaftto be raised and lowered thereby, a cross plate adjacent to the lowerend of said link, a bolt passing through the lower portion of said linkand through saidcross plate, a s ring beneath the cross plate andsurroun ing said bolt and hearing at one end against the cross plate andhaving a hearing at its opposite 7 end against the lower end of thebolt, linkage between the op osite ends of the cross plate at opposites1 es of said bolt and havmg connection with the dumping means of thebucket, and means for tripping the trip mechanism to lower said curved.link and raise it, the dumpin means becoming operative when the lin islowered and inoperative when the link-is raised.

17. In a concrete distributor in combination with a boom, a distributingbucket, a carriage movable back and forth on the boom to carry saidbucket, trip mechanism on the carriage including a curved knockoverlink, the bucket having dumping means at its bottom, a cross plate,linkage connecting the ends of said cross plate with the dumping meansof the bucket and a resilient connection intermediate said knockovermember and said cross plate as and for the purpose described, theknock-over member being adapted to be raised and lowered by the tripmechanism to maintain the dumping means of the bucket closed and openrespectively.

18. In a boom and bucket concrete distributor, the combination with aboom, a carriage to traverse the same, a bucket supported by thecarriage a supporting framewhich the boom ispivotally connected, an

other bracket device includin a worm gear appliance for swinging the00m, and resilient bufier means intermediate the carriage and one ofsaid bracket devices.

19. In a boom and bucket concrete distributor, the combination with aboom, a carriage to traverse the same, a bucket supported by thecarriage, a supporting framework, a bracket device mounted on saidframe-work to support the boom and to which the boom is'pivotallyconnected, an-

other bracket device including a worm gear appliance for swinging theboom, resilient bufi'er means intermediate the carriage and one of saidbracket devices and comprising springs adapted to absorb the shockbetween the carriage and said bracket device as the carriage reaches theend of the boom supported by the bracket device.

20. In a boom and bucket concrete distributor, the combination with aboom, a

carriage to traverse the same, a bucket supported by the carriage, asupporting framework, a bracket device mounted on said frame-work tosupport the boom and to which the boom is pivotally connected, anotherbracket device including a worm gear appliance for swinging the boom,resilient bufi'er means intermediate the carriage and one of saidbracket devices and comprising springs carried by parts of the-bracketdevice above mentioned, and adapted to be compressed by cooperation withthe carriage as the latter reaches the end of the directly cooperatingwith said cable means for braking the movement of the carriage as itoperates on the boom.

22. In a boom and bucket concrete distributor, in combination, a boom, acarriage to traverse the boom, a bucket supported by the carriage, cablemeansfor moving the carriage on the boom, brake means directlycooperating with said cable means for braking the movement of thecarriage as it opcrates on the boom and manual and automatic devices tocontrol the action of said brake means.

I In testimony whereof I afiix my signature.

ERICH H. LICHTENBERG.

